JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zilong Zhang,Shuai Wang,Yangyang Lv,Xiqiao Chen,Zhuang Wu,Yanhong Zou
In this work, MnO 2 -deposited graphene foams (MnO 2 /GFs) were synthesized using a simple hydrothermal method . By controlling the content of MnO 2 deposited on the surface of graphene skeleton, a series of MnO 2 /GFs composites are easily synthesized. Benefiting from the well-designed interconnected 3D porous network structure and strong interfacial polarization between MnO 2 nanoparticles and graphene skeleton, the MnO 2 /GFs composite displays excellent microwave absorbing properties. The optimized MnO 2 /GFs nanocomposite achieves the strongest electromagnetic absorption with a reflection loss (RL) of −53 dB and the qualified absorption bandwidth is up to 7.0 GHz. The results may provide some valuable design guidelines for lightweight, wide-band, and highly efficient electromagnetic wave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Bing Tan,Huimin Zhao,Yaobin Zhang,Xie Quan,Zehao He,Wenting Zheng,Bingyu Shi
Phytic acid (PA) induced graphene macrostructures were synthesized and investigated for the sorption characteristics and mechanisms of mercury. The as-synthesized graphene foam possessed large specific surface area and amphiphilicity. FTIR and XPS analysis revealed that the as-prepared graphene macrostructure retained oxygen-containing functional groups after hydrothermal reduction and also captured new phosphorus-containing groups because of the introduction of PA. Different experimental parameters, such as pH, PA fractions and contact time were applied to probe into the Hg(II) adsorption performance of as-synthesized macrostructure. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well to the obtained sorption kinetic and isothermal data. The maximum adsorption capacity at pH = 7.2 for mercury was 361.01 mg/g. The dominant mechanisms for mercury removal were mainly ion exchange and surface complexation. Real application in river water and seawater exhibited very promising results, indicating its broad prospect in water purification .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yunfeng Qiu,Jingjing Liu,Yue Lu,Rui Zhang,Wenwu Cao,PingAn Hu
Backing materials play important role in enhancing the acoustic performance of an ultrasonic transducer. Most backing materials prepared by conventional methods failed to show both high acoustic impedance and attenuation, which however determine the bandwidth and axial resolution of acoustic transducer, respectively. In the present work, taking advantage of the structural feature of 3D graphene foam as a confined space for dense packing of tungsten spheres with the assistance of centrifugal force, the desired structural requirement for high impedance is obtained. Meanwhile, superior thermal conductivity of graphene contributes to the acoustic attenuation via the conversion of acoustic waves to thermal energy. The tight contact between tungstate spheres, epoxy matrix, or graphene makes the acoustic wave depleted easily for the absence of air barrier. The as-prepared 3DG/W80 wt %/epoxy film in 1 mm, prepared using ∼41 μm W spheres in diameter, not only displays acoustic impedance of 13.05 ± 0.11 MRayl but also illustrates acoustic attenuation of 110.15 ± 1.23 dB/cm MHz. Additionally, the composite film exhibits a high acoustic absorption coefficient, which is 94.4% at 1 MHz and 100% at 3 MHz, respectively. Present composite film outperforms most of the reported backing materials consisting of metal fillers/polymer blending in terms of the acoustic impedance and attenuation.
研究领域:
材料科学
·
声学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhiwei Zhang,Zhihao Cai,Lun Xia,Dan Zhao,Fei Fan,Yi Huang
Electromagnetic wave (EMW)-absorbing materials have a great impact on civil use and national defense. In this paper, a novel composite, RGO@6CoTe2-300 (the mass ratio of reduced graphene oxide to CoTe2 is 1:6, annealed at 300 °C), has been obtained through a facile melt-diffusion method and solvothermal method. The as-prepared samples have shown excellent reflection losses (RL) and effective adsorption bandwidth (EAB) by controlling the loading of CoTe2 and the annealing temperature. The sample has exhibited a RL of −62.2 dB at 13.04 GHz with the matching thickness of 3.53 mm, and the EAB reaches 8.2 GHz at 2–18 GHz. Moreover, excellent terahertz (THz) absorption property is also obtained at 0.2–2.0 THz. A RL of 54.07 dB is acquired, and the EAB covers 100% of the entire measured bandwidth. Thus, RGO@6CoTe2-300 can be considered as a promising EMW absorption material in both gigahertz and terahertz band ranges.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Wenxing Luo,Xiaowu Hu,MinMing Zou,Lixiang Luo,Yan Ma,Wenjing Chen,Xiongxin Jiang
Use of Phase Change Materials (PCM) for thermal energy storage has been a research hotspot in the field of energy storage. However, the development of composite PCM is always hindered by liquid leakage and poor photo-/electro-thermal conversion efficiency of PCM. In this work, inspired by the preparation of frozen tofu, a novel graphene foam (GF) was prepared by the method. Then polypyrrole (PPy) was successfully coated on the surface of GF by vapor phase deposition, to obtain GF@PPy. Finally, polyethylene glycol (PEG) was supported using GF@PPy, which effectively prevented the leakage of PEG, and successfully obtained a form-stable composite PCM (PEG/GF@PPy) with photo/electro-thermal conversion property. Research indicates that owing to the π-electrons in the molecular chain of PPy are freely movable, which endows PPy possess excellent electrical and thermal conductivity. It ultimately results in the introduction of PPy improve the thermal and electrical conductivity of composite PCM. It makes PEG/GF@PPy exhibit an effective electro-thermal conversion efficiency of 89.6 %. Moreover, PPy as an excellent photothermal conversion material, enhanced the photothermal conversion efficiency of PEG/GF@PPy up to 90.3 %. Finally, the composite PCM with photoelectric/electrical heat conversion property is applied to the field of thermotherapy. Comparison of popular thermotherapy products indicates that PEG/GF@PPy was able to provide longer duration of thermotherapy, up to 77.8 min. The strategy reported in this paper may assist in the preparation of composite PCM with high photo/electro-thermal conversion efficiency for use in the thermotherapy field.
研究领域:
能源存储
·
材料科学
·
医学应用
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2024
·Vol. 15
·期 11
·1355
·
IF 3
Wentao Li,Jianxin Zhou,Wei Sheng,Yuxi Jia,Wenjie Xu,Tao Zhang
A flexible pressure sensor, capable of effectively detecting forces exerted on soft or deformable surfaces, has demonstrated broad application in diverse fields, including human motion tracking, health monitoring, electronic skin, and artificial intelligence systems. However, the design of convenient sensors with high sensitivity and excellent stability is still a great challenge. Herein, we present a multi-scale 3D graphene pressure sensor composed of two types of 3D graphene foam. The sensor exhibits a high sensitivity of 0.42 kPa−1within the low-pressure range of 0–390 Pa and 0.012 kPa−1within the higher-pressure range of 0.4 to 42 kPa, a rapid response time of 62 ms, and exceptional repeatability and stability exceeding 10,000 cycles. These characteristics empower the sensor to realize the sensation of a drop of water, the speed of airflow, and human movements.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Zhe Wang,Fanyu Lin,Liqin Huang,Zhili Chang,Bing Yang,Shuang Liu,Maosheng Zheng,Yuexiang Lu,Jing Chen
As a useful heavy metal ion , chromium has seen its applications in various fields. While it is also a toxic contaminant in water and may cause serious threats to the environment and human health. To develop a novel material with good adsorption capacity and easy solid-liquid separation strategy was necessary and significant. In this paper, the β-cyclodextrin (β-CD) functionalized three-dimensional structured graphene foam (CDGF) was successfully synthesized with the facile and one-step hydrothermal method. The SEM , BET, XRD, FT-IR and XPS analysis were carried out and the results confirmed the successfully grafting of β-CD onto GF. The batch adsorption of Cr(VI) was also taken out and the CDGF possessed good selectivity compared with other metal ions at pH = 3. The adsorption capacity reduced gradually as the initial pH of the Cr(VI) solution grew higher, which was because the anionic species of Cr(VI) were partial to the positively charged surface of CDGF. The easy separation strategy of the CDGF was also demonstrated and the CDGF could be taken out easily with a tweezer after the adsorption of Cr(VI), which significantly simplified the separation procedure and reduced time. By comparing the FT-IR and XPD analysis results, the adsorption mechanism was explored and the hydroxyl groups on CDGF played the main role in the adsorption process. This work brings a novel material for the adsorption of Cr(VI) from water and provides an innovative direction for the easy and fast solid-liquid separation strategy in the adsorption and other application fields.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 8
·2407957
·
IF 12.1
Wei Sheng,Jianxin Zhou,Yuxi Jia,Wentao Li,Ruixi Qiao,Zixi Liu,Wenjie Xu,Tao Zhang
Stretchable hydrogel devices are highly desirable for their capacity to seamlessly integrate significant stretchability, high conductivity, and exceptional biocompatibility. Nonetheless, the substantial disparity in stiffness between soft hydrogels and commonly rigid electrode materials often leads to pronounced performance fluctuations or even complete failure of sensor circuits in practical applications. Here, the study introduces an intrinsically stretchable graphene-hydrogel strain sensor (GHSS) fabricated by integrating a hydrogel and a 3D graphene foam with very closely matched elastic moduli. The GHSS demonstrates a strain detection limit of 0.02%, a rapid response time of 64 ms, and long-term stability, enabling the detection of human joint movements, physiological signals, touch pad input, and exercise monitoring.
研究领域:
材料科学
·
生物医学工程
·
传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Fei An,Xiaofeng Li,Peng Min,Pengfei Liu,Zhi-Guo Jiang,Zhong-Zhen Yu
Although graphene-based thermal interface materials (TIMs) have great potentials in removing excess heat generated during highly efficient running of electronic devices, their practical applications are usually limited by their unsatisfactory thermal conductions, which are mainly caused by unsatisfactory dispersion and distribution, low loading, and low quality of graphene sheets, as well as the thermal interfacial resistance between graphene sheets and polymer matrix. Herein, we develop vertically aligned graphene hybrid foams (GHFs) with high densities by hydrothermal reduction of graphene oxide in the presence of high-quality graphene nanoplatelets (GNPs) followed by air-drying. The reduced graphene oxide sheets play an important role in constructing a vertically aligned interconnection network for accommodating GNPs during the hydrothermal reduction process, while the incorporated GNPs not only make the thermal conductance network denser but also prevent excessive shrinkage of the foams during air-drying. More critically, graphitization of GHF at 2800 °C removes the residual oxygen-containing groups and heals the defects of their reduced graphene oxide component, leading to high-quality graphene foams. The resultant vertically aligned high-quality graphene porous architecture with high density as an ideal thermal conductance network of TIMs is highly efficient in improving the thermal conductivity of its epoxy composite, which exhibits an ultrahigh through-plane thermal conductivity of 35.5 W m–1 K–1 at a graphene loading of 19.0 vol %. The excellent thermally conductive performance makes the annealed GHF/epoxy composites suitable for the thermal management.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Shicai Xu,Chao Zhang,Shouzhen Jiang,Guodong Hu,Xiaoyue Li,Yan Zou,Hanping Liu,Jun Li,Zhenhua Li,Xiaoxin Wang,Mingzhen Li,Jihua Wang
As the major energy molecule of cells, adenosine triphosphate (ATP) regulates various biological processes and has been found to be closely related to many diseases. Therefore, ATP detection in trace amounts is very useful for understanding various biological processes, studying cellular events such as proliferation and apoptosis, and estimating contaminated degree of food and medical instrument. To date, the trace sensing ATP at picomolar level in biological systems is still a major challenge. Because of unique electrical and structural properties, graphene has attracted much attention in biosensing applications. Here, a sensitive and selective graphene foam field-effect transistor (GF-FET) biosensor for ATP detection is demonstrated. The lowest detection limit of the biosensors for analyzing ATP is down to 0.5 pM, which is one or several orders lower than the reported results. Moreover, the GF-FET biosensor show a good linear current response to ATP concentrations in a broad range from 0.5 pM to 50 μM. The GF-FET sensor surface can be regenerated for many times and used for up to weeks without significant loss of functionality. Based on this sensing platform, label-free measurements of ATP concentrations in human serum as well as in cell lysate are demonstrated. The work may provide a novel platform to study ATP release and energy-regulated biological processes, suggesting a promising future for biosensing applications.
研究领域:
生物传感器
·
材料科学
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 10
·2723-2730
·
IF 5.256
Jinhui Li,Weixin Li,Wangping Huang,Guoping Zhang,Rong Sun,Ching-Ping Wong
Three-dimensional (3D) compressible carbon-based foams with ultralow density, high porosity and excellent electrical conductivity have aroused considerable interest especially as pressure sensors, recyclable absorbents and for other advanced applications. Herein, highly compressible 3D graphene/carbon nanotube foams (GCFs) were prepared by a facile self-assembly process under mild conditions. The incorporation of CNTs into graphene resulted in great improvement of their mechanical and compressible properties compared with the graphene-only foam (under a high strain of 80% and a higher stress of 25.64 kPa). Besides, the GCFs exhibited excellent piezoresistive properties with high sensitivity (with a high gauge factor of 8.4 at a strain of 10%) and great stability during the compression cycles which was quite important for the pressure sensors. In addition, the compressible GCFs also possessed excellent adsorption capacity for organic solvents with great reusability. With unique electrical features and high sensitivity as well as robust mechanical strength, the as-fabricated 3D GCFs possess great potential as elastic pressure sensor materials, absorbents and beyond.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Jianglin Diao,Zhihao Cai,Lun Xia,Ziyuan Wang,Zhanzhao Yin,Xiaoyan Liu,Wenle Ma,Yi Huang
Graphene foam (GF) has grabbed considerable attention for microwave absorption (MA) due to its high specific surface area, rich micro-nano structures and versatile processing. However, restricted by the intrinsic electromagnetic properties of graphene, the MA property of GF is usually unsatisfactory. To further improve the absorption strength of GF, groundbreakingly, the thermoelectric material Bi 2 Te 2 .7 Se 0.3 (BTS) and graphene are combined to form Bi 2 Te 2 .7 Se 0.3 /GF (BTSGF) composites through a solvothermal self-assembly method. BTSGF composites have achieved much enhanced MA properties. The minimal reflection loss (RL min ) and the qualified absorption bandwidth of BTS9GF-200 (90 wt% BTS, annealed at 200 °C) reaches improved −73.0 dB and 5.32 GHz, respectively. Meanwhile, BTS3GF-300 (30 wt% BTS, annealed at 300 °C) exhibits an impressive qualified absorption bandwidth of 8.9 GHz and achieves an enhanced RL min of −58 dB. The enhanced MA performance of BTSGF stems from various synergistic effects of BTS and GF, such as conduction loss and polarization. More importantly, BTS's thermal energy-electric energy conversion capability is believed to can quickly convert heat into electricity and strengthen the attenuation of electromagnetic waves. Therefore, a new electromagnetic wave-thermo-electric loss MA mechanism is proposed, which is of great significance to the study of thermoelectric materials as high-efficiency MA materials .
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）